def find(cls, where='.', exclude=(), include=('*',)):
"""Return a list all Python packages found within directory 'where'
'where' should be supplied as a "cross-platform" (i.e. URL-style)
path; it will be converted to the appropriate local path syntax.
'exclude' is a sequence of package names to exclude; '*' can be used
as a wildcard in the names, such that 'foo.*' will exclude all
subpackages of 'foo' (but not 'foo' itself).
'include' is a sequence of package names to include. If it's
specified, only the named packages will be included. If it's not
specified, all found packages will be included. 'include' can contain
shell style wildcard patterns just like 'exclude'.
The list of included packages is built up first and then any
explicitly excluded packages are removed from it.
"""
out = cls._find_packages_iter(convert_path(where))
out = cls.require_parents(out)
includes = cls._build_filter(*include)
excludes = cls._build_filter('ez_setup', '*__pycache__', *exclude)
out = filter(includes, out)
out = filterfalse(excludes, out)
return list(out)
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